Does the 40" max size refer to measuring the screen diagonally or horizontally?
I have an LG 42LV5500. The screen is 40" measured horizontally but it is considered a 42" TV because they measure the screen diagonally. So is this model LG compatible with this wall mount? The weight of the TV is 29 lbs.
The measurement is diagonally. It would void the warranty and you would assume all risk, but I'm pretty certain that the TV weight would not be an issue at all - my 40" visio is the same weight on my bathroom scale. What may be an issue however, is the mounting screws on the back of the TV - there are four of them, two on each side. The two on each side are four inches apart vertically and the two pairs are 4.25 inches apart horizontally. If this matches up with the holes on the back of your TV (i.e. the holes are a rectangle that is 4 by 4.25) you should be ok.